package org.drools.workflow.instance.node;



/*

 * Copyright 2005 JBoss Inc

 * 

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 * 

 *      http://www.apache.org/licenses/LICENSE-2.0

 * 

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */



import org.drools.process.core.context.exception.ExceptionScope;

import org.drools.process.core.context.variable.VariableScope;

import org.drools.process.instance.ProcessInstance;

import org.drools.process.instance.context.exception.ExceptionScopeInstance;

import org.drools.process.instance.context.variable.VariableScopeInstance;

import org.drools.workflow.core.Node;

import org.drools.workflow.core.node.FaultNode;

import org.drools.workflow.instance.NodeInstance;

import org.drools.workflow.instance.impl.NodeInstanceImpl;



/**

 * Runtime counterpart of a fault node.

 * 

 * @author <a href="mailto:kris_verlaenen@hotmail.com">Kris Verlaenen</a>

 */

public class FaultNodeInstance extends NodeInstanceImpl {



    private static final long serialVersionUID = 400L;

    

    protected FaultNode getFaultNode() {

        return (FaultNode) getNode();

    }

    

    public void internalTrigger(final NodeInstance from, String type) {

        if (!Node.CONNECTION_DEFAULT_TYPE.equals(type)) {

            throw new IllegalArgumentException(

                "A FaultNode only accepts default incoming connections!");

        }

        String faultName = getFaultName();

        ExceptionScopeInstance exceptionScopeInstance = getExceptionScopeInstance(faultName);

        getNodeInstanceContainer().removeNodeInstance(this);

        if (exceptionScopeInstance != null) {

        	handleException(faultName, exceptionScopeInstance);

        } else {

        	getProcessInstance().setState(ProcessInstance.STATE_ABORTED);

        }

    }

    

    protected ExceptionScopeInstance getExceptionScopeInstance(String faultName) {

    	return (ExceptionScopeInstance)

    		resolveContextInstance(ExceptionScope.EXCEPTION_SCOPE, faultName);

    }

    

    protected String getFaultName() {

    	return getFaultNode().getFaultName();

    }

    

    protected Object getFaultData() {

    	Object value = null;

    	String faultVariable = getFaultNode().getFaultVariable();

    	if (faultVariable != null) {

    		VariableScopeInstance variableScopeInstance = (VariableScopeInstance)

            	resolveContextInstance(VariableScope.VARIABLE_SCOPE, faultVariable);

            if (variableScopeInstance != null) {

                value = variableScopeInstance.getVariable(faultVariable);

            } else {

                System.err.println("Could not find variable scope for variable " + faultVariable);

                System.err.println("when trying to execute fault node " + getFaultNode().getName());

                System.err.println("Continuing without setting value.");

            }

    	}

    	return value;

    }

    

    protected void handleException(String faultName, ExceptionScopeInstance exceptionScopeInstance) {

        exceptionScopeInstance.handleException(faultName, getFaultData());

    }



}